Yanmar 3TNV88F Service Manual page 128

ENGINE
■ Inspection of tappets
1. Inspect the tappet contact surfaces for
abnormal wear (Figure 6-72, (1)). Normal wear
will be even as shown in (Figure 6-72, (2)).
Slight surface defects can be corrected using
an oilstone.
1
Figure 6-72
2. Measure the outside diameter of the tappet
stem (Figure 6-73, (1)). See Tappet on
page 6-9 for the service limit.
Figure 6-73
3. Measure the tappet bores in the cylinder block.
See Tappet on page 6-9 for the service limit.
6-44
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K0001725
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K0001726A
Crankshaft and Camshaft Components
■ Inspection of crankshaft
1. Place the crankshaft end journals
(Figure 6-74, (4)) on V-blocks.
2. Place a dial indicator (Figure 6-74, (3)) on a
center main bearing surface.
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1
4
Figure 6-74
3. Rotate the crankshaft and observe runout. See
Crankshaft on page 6-7 for specifications.
4. Use the color check method or Magnaflux
inspect the crankshaft for cracks. Replace the
crankshaft if evidence of fractures are found.
5. Measure the outside diameter of each crankpin
(Figure 6-75, (2)) and main bearing journal
(Figure 6-75, (1)). See Crankshaft on page 6-7
for specifications. Take measurements at
several places around each bearing surface. If
not within specification, grind the journals and
install undersize bearings, or replace the
crankshaft.
3TNV88F Service Manual
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K0000232A
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